Tube Converter - Yellow Jacket® YJShort, for reduced-size amps

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Tube Converter - Yellow Jacket® YJShort, for reduced-size amps

$36.95
In Stock

The YJShort is shorter than the standard YJS converter, allowing for use in amps that do not have room for the standard converters. It is a specialized, current-limiting/voltage-conditioning adapter for use in most 20 to 100 watt amps which use 6L6, EL34, 6550 or 6V6 output tubes.

  • Converts most audio amplifiers with 6L6s, EL34s, 6550s, or 6V6s and similar-based tubes to EL84s without modification or rebiasing.
  • Converts: Class AB to Class A operation
  • Drops Output Power: 50% to 70%. The triode version provides a greater power reduction and more linearity than the standard (pentode) version.
  • Safe for all common amplifiers and transformers.

Converter-only. Tubes not included. Requires an EL84 vacuum tube (see accessories below for options).


Yellow Jacket® converters are a type of specialized adapter which permit the use of EL84/6BQ5 power tubes in place of 6V6, 6L6, EL34, and 7591 type vacuum tubes. Yellow Jacket® converters allow you to harness the musicality of EL84 vacuum tubes in amps that don't use them already - it's like getting a whole new amplifier!

There is no rebiasing involved, which makes modifying your amp's tone very easy. Yellow Jacket® converters give you simple Class-A operation from any amp. They not only rearrange the pin locations of the tubes, but also provide the necessary plate voltage drop and current limiting on the screens as well as blocking the amplifier's grid bias voltage while configuring the EL84 in a Class-A, self-adjusting cathode-bias circuit. In other words, there are no adjustments to make and no modifications necessary, you simply plug the Yellow Jacket® into the amp's output tube sockets, plug the EL84s into the Yellow Jacket® converters, turn on the amp and play.

All Yellow Jacket® converters have a one year warranty against manufactured defects.

Part Numbers
TypeOur Part Number
Standard (Pentode)P-SAYJ-SHORT
Reduced Power (Triode)P-SAYJ-T-SHORT
Product Measurements by Type
Item DiameterStandard (Pentode) versionP-SAYJ-SHORT1.301 in.
Item Height, without pinsStandard (Pentode) versionP-SAYJ-SHORT1.68 in.
Item Height, with tubeStandard (Pentode) versionP-SAYJ-SHORT4.5 in.
Packaging Information
Packaging Dimensions2.25 in. × 1.625 in. × 4.625 in.
Weight (Packaging)0.096 lbs.
Product Measurements by Item
P-SAYJ-SHORT - Standard (Pentode) versionItem Diameter1.301 in.
Item Height, without pins1.68 in.
Item Height, with tube4.5 in.

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Product Reviews

5.00 out of 5 based on 1 reviews
- April 7th, 2020
5 out of 5

Used Yellow Jackets and destroyed my Amp.
No support from Yellow Jacket.
Buyer beware.